/usr/lib/python2.7/dist-packages/Aster/prefs.py is in eficas 6.4.0-1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/Aster/../../../../share/pyshared/Aster/prefs.py
/usr/lib/python2.7/dist-packages/Aster/../../../../share/pyshared/Aster/prefs.py